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y = [ x(x^2+1)/(x^2-1)^2 ]^(1/3)
lny =(1/3) [ lnx+ ln(x^2+1) - 2ln(x^2 -1) ]
(1/y)y' = (1/3) [ 1/x+ 2x/(x^2+1) - 4x/(x^2 -1) ]
y' =(1/3) [ 1/x+ 2x/(x^2+1) - 4x/(x^2 -1) ] . [ x(x^2+1)/(x^2-1)^2 ]^(1/3)
lny =(1/3) [ lnx+ ln(x^2+1) - 2ln(x^2 -1) ]
(1/y)y' = (1/3) [ 1/x+ 2x/(x^2+1) - 4x/(x^2 -1) ]
y' =(1/3) [ 1/x+ 2x/(x^2+1) - 4x/(x^2 -1) ] . [ x(x^2+1)/(x^2-1)^2 ]^(1/3)
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